Perhaps you should try some spelling variations:
gene sang » lee sang, gene bank
yang yang » wang yang, wang yan
sang minh » kang minah, anh minh, song min
duong van » duong anh
cong seo » hong seo, cong shu, cong sun
cong van » congo can, cong sun
yi hua » li hua, yi hui, ying hua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: yang yang ((yi hua) or (ya hua)) gene sang minh ((cong seo) or (((cong van) OR (duong van)))) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: yang yang ((yi hua) OR (ya hua)) gene sang minh ((cong seo) OR (((cong van) OR (duong van)))) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang yang ((yi hua) or (ya hua)) gene sang minh ((cong seo) or (((cong van) OR (duong van)))) ;".
• Adding a wildcard symbol may retrieve word variants: yang yang ((yi hua) or (ya hua)) gene sang minh ((cong seo) or (((cong van) OR (duong van)))) ;*.